What is it when your not satisfied despite eating, because food is not sweet?

I had a huge breakfast of pistachios this morning and than by lunch, I felt like the food could not come fast enough and I’ve been unsatisfied hours today cause it seems my body wants sweets and does not care about anything else. What is going on? Lower blood sugar? Lower insulin?
What is it when your not satisfied despite eating, because food is not sweet?
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